Drinkwell Fountain Replacement Cartridge Filters 3 Pack Noise CD jaw pieces and materials jaw pieces and materials SIZE CHART* Size Neck (A) Chest (B) Back (C)* X Small 14 in (36 cm) 15 – 20 in (38 – 51 cm) 10 in (25 cm) Small 16 in (41 cm) 19 – 27 in (48 – 69cm) 13 ¼ in (34 cm) Medium 19 in (48 cm) 26 – 35 in (66 – 89 cm) 19 ¾ in (50 cm) Large 23 in (58 cm) 30 – 39 in (76 – 99 cm) 22 ½ in (57 cm) X Large 26 in (66 cm) 35 – 45 in (89 – 114 cm) 27 in (69 cm) * Back coverage (C) will vary while the charcoal removes bad tastes and odours from the water making it more appealing to drink Each filter features a duo density polyester pad that catches hair and debris